Alaska is about 135 times bigger than Jamaica.

Jamaica is approximately 10,991 sq km, while Alaska is approximately 1,481,348 sq km, making Alaska 13,378% larger than Jamaica. Meanwhile, the population of Jamaica is ~2.8 million people (2.1 million fewer people live in Alaska).
Tip: This to-scale comparison of Jamaica vs. Alaska uses the Mercator projection, which distorts the size of regions near the poles.